White Heather (Calluna vulgaris) has a longstanding place in traditional herbal medicine, particularly in European folk remedies. Historically, various parts of the plant have been used externally for skin conditions, including rashes and hives (urticaria), due to its purported anti-inflammatory and soothing properties. Preparations such as poultices or infusions were sometimes applied to the skin to calm irritation and reduce redness. This use is documented in ethnobotanical literature and old herbal texts, where White Heather was recommended for managing a range of skin complaints, though typically as part of broader herbal blends rather than as a primary treatment.

Despite this traditional application, there is little to no modern scientific research or clinical evidence validating the efficacy of White Heather for treating rashes or hives. Contemporary pharmacological studies on Calluna vulgaris have primarily focused on its potential antioxidant and antimicrobial properties, rather than its effects on skin inflammation or allergic responses. The lack of controlled studies or robust scientific data means that its use for rashes and hives remains supported mainly by historical precedent rather than evidence-based medicine.

In summary, while White Heather has traditional use for soothing skin conditions, the evidence supporting its efficacy for rashes and hives is weak and not substantiated by modern science.